If Jolla is done the right way, it will be awfully easy to port all those QML & Qt from N900/N9/Nemo to their OS. If it reuses what has been done these last years, it will quickly be able to support tablets.

What is needed isn't another closed ecosystem: we want to be able to reuse the existing one ! If they really intend to go on the market, they *must* be compatible with Tizen and N9. All these OS share the same roots, nearly the same kernel, have (or will have) nearly the same Qt support.

So my answer is: all that already exists for Qt/N9.